1999 bravo emission problem?

my 1999 1.2sk bravo has terrifically high emission my brother as tried everything he can think of latest exaust ,cat converter been on a diognostic mechanism 3 times still cannot find the prob as it is it can't pass the NCT, one-time twice i would be grateful for any solutions


Answers:    Could be something as simple as a desperate p.c.v. valve cause blow by into intake to worn valve guide seal or rings. O2 not switching fast adequate or a thousand other things. You need to find a competent shop that properly know how to use an exhaust gas analyzer to narrow down exactly which gasses are too soaring or low and why.
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